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letters continued with the jig, the guide bushing needs to be placed in exactly the same position as before, normally exactly centered on the axis of the bit. If not, the router will remove a little material from the lower rail of the jig, which ultimately will ruin the fit of the shelf. Here’s the trouble. In the case of the Porter-Cable router shown in the article, the plate that holds the guide bushing fastens to the router base with three screws, and there is more than 1 ⁄16 in. of play in its positioning. —KEN WAGNER, South Pasadena, Cal i f. Editor replies: We should have pointed out that very important fact in the article. Here’s the solution. Get a centering cone for your router. They are cheap and widely available. You insert the template guide bushing (and its mounting plate, on some routers), chuck the shaft in the router collet, and then plunge the base to engage the cone in the bushing. This centers the bushing perfectly as you tighten the mounting plate. Some manufacturers include these cones in their router kits. Corrections on two recent tool tests The winner of “Bench Grinders for Woodworkers” (FWW #226), the Porter-Cable PCB575BG, is available at Lowes stores and Lowes.com with a 36-grit wheel and a 60-grit wheel (not 120-grit as cited). This is even better news for woodworkers, as a medium-grit wheel is best for grinding tool steel. Dust separators do a great job at collecting fine particles before they can reach a shop vacuum’s filter, thus keeping the filter unclogged and greatly improving airflow/suction. When we last tested them, however (FWW #223), our brief writeup left a number of false impressions about the Oneida Dust Deputy, implying that it is not mobile (the $79 Deluxe Kit includes casters) and that its inlet and outlet will not fit larger vac hoses (its tapered design fits a variety of hoses, including the larger standard 21 ⁄4-in.-dia. size). Also, while we gave the Dust Deputy credit for capturing more of the fine dust than its competitors, we underestimated the impact that would have on the filter over the longer haul, in terms of keeping it cleaner and maintaining airflow. Clever cone. You chuck a centering cone in your router as shown, and then release the plunge base to engage the cone and align the template guide. (On this router, you loosen the whole baseplate to align the guide.) Add-on riving knife got a bad rap A recent clarification on the Letters page (FWW #226) said that the Bork About your safety Working wood is inherently dangerous. Using hand or power tools improperly or ignoring standard safety practices can lead to perm anent injury or even death. Don’t perform operations you learn about here 12 F I N E WO O DWO R K I N G (or elsewhere) until you’re certain they are safe for you. If something about an operation doesn’t feel right, find another way. We want you to enjoy the craft, so please keep safety foremost in your mind. aftermarket riving knife add-on caused FWW editors to “pause,” due to its overall design and the requirement that the purchaser sign a waiver. I helped to upgrade the Delta Unisaw at my retirement community’s woodshop with the Bork Bolt-On Ripping Knife ($110 at TheBorkStore.com) and the Bork DustCollecting Blade Cover ($130). They both work well, and cost far less than a brand-new saw with a riving knife. The only recommendation I have for the manufacturer is to make the riving knife out of steel instead of aluminum, and/or back up the bolt attachment with fender washers against each face for more lateral stability. The installation instructions are not all that clear, but with two engineers working on it, we managed fine. Last, the Bork universal riving knife add-on is the product of two years of development by an individual entrepreneur working in his own shop, not a large company backed by an inhouse legal department, and the product sells for barely more than the cost of the materials and labor involved in making it. As such, the liability waiver is understandable. —ROBERT A. CHAGNON, Greenvi l le, Del . My scraper fi nally works, thanks to Mike Pekovich The latest issue (FWW #227) arrived today. I immediately read the article on card scraper sharpening. I then went to my shop, made the blade holder, and followed Mr. Pekovich’s instructions. Within a matter of minutes, I was making fine curly shavings on red oak. I have fussed with sharpening card scrapers for years. Now I can sharpen one that really cuts. Thanks for a fine and useful article. —LYNN BARTLETT, Tulsa, Okla.